Yes, there are some archives that you simply cannot be without if you like chipmusic. HVSC being on top of the list in my opinion followed by the SNDH Collection, 2a03 archive (sadly down at the moment, and was not very updated lately).

Archives of .MODs etc is harder to store and update, since the filesize (usually) is a lot bigger than .SIDs, .SNDs etc. But the list of archives found at the 8bit today post Chema64 also mentioned is very helpful.